Safened dimethenamid herbicidal compositions

ABSTRACT

Mixtures of a herbicidally effective amount of a haloacetamide of formula I ##STR1## and, to antagonize the herbicide, an antidotally effective amount of a compound of formula II 
     
         R--CHYCl                                                   (II) 
    
     wherein R is defined herein, suitable for controlling weeds in crops of cultivated plants, particularly maize.

This is a continuation of Ser. No. 08/214,738, filed Mar. 17, 1994, abandoned.

The present invention relates to a selective herbicidal composition for controlling grasses and weeds in crops of cultivated plants, especially in crops of maize, which composition comprises a herbicide and a safener (antidote) and protects the cultivated plants, but not the weeds, from the phytotoxic action of the herbicide, and to the use of said composition or combination of herbicide and safener for controlling weeds in crops of cultivated plants.

When applying herbicides, the cultivated plants may also suffer severe damage owing to factors that include the concentration of the herbicide and the mode of application, the cultivated plant itself, the nature of the soil, and the climatic conditions such as exposure to light, temperature and rainfall.

To counteract this problem and similar ones, the proposal has already been made to use different compounds as safeners which are able to antagonise the harmful action of the herbicide on the cultivated plant, i.e. to protect the cultivated plant while leaving the herbicidal action on the weeds to be controlled virtually unimpaired. It has, however, been found that the proposed safeners often have a very specific action, not only with respect to the cultivated plants but also to the herbicide, and in some cases also subject to the mode of application, i.e. a specific safener will often be suitable only for a specific cultivated plant and a specific class of herbicide.

It has now been found that certain chloroacetamides are suitable for protecting cultivated plants from the phytotoxic action of the compound of formula I ##STR2##

Accordingly, the invention provides a selective herbicidal composition comprising, in addition to customary inert formulation assistants such as ,carders, solvents and wetting agents, a mixture of

a) a herbicidally effective amount of a compound of formula I ##STR3## and b) to antagonise the herbicide, an antidotally effective amount of a compound of formula I

    R--CHYCl                                                   (II)

wherein R is a radical of formula ##STR4## wherein R₃₃ and R₃₄ are each independently of the other C₁ -C₆ alkyl or C₂ -C₆ alkenyl; or R₃₃ and

R₃₄, taken together, are ##STR5## R₃₅ and R₃₆ are each independently of the other hydrogen or C₁ -C₆ alkyl; or R₃₃ and R₃₄, taken together are ##STR6## R₃₇ and R₃₈ are each independently of the other C₁ -C₄ alkyl, or R₃₇ and R₃₈, taken together, are --(CH₂)₅ -;

R₃₉ is hydrogen, C₁ -C₄ alkyl or ##STR7## or R₃₃ and R₃₄, taken together, are ##STR8## R₄₀, R₄₁, R₄₂, R₄₃, R₄₄, R₄₅, R₄₆, R₄₇, R₄₈, R₄₉, R₅₀, R₅₁, R₅₂, R₅₃, R₅₄ and R₅₅ are each independently of one another hydrogen or C₁ -C₄ alkyl, or R is a radical of formula ##STR9## or R is a radical of formula ##STR10## wherein R₁, R₂, R₃ and R₄ are each independently of one another hydrogen, C₁ -C₄ alkyl, C₁ -C₄ alkoxy or C₁ -C₄ haloalkyl, R₅, R₆, R₇ and R₈ are each independently of one another hydrogen, C₁ -C₄ alkyl or C₁ -C₄ haloalkyl, or R is a radical of formula ##STR11## wherein R₉ is C₁ -C₄ alkyl or halogen, R₁₀ is halogen, R₁₁ and R₁₂ are each independently of the other hydrogen or C₁ -C₄ alkyl, and Q is C₁ -C₄ alkylene or alkyl-substituted C₁ -C₄ alkylene, or R is a radical of formula ##STR12## wherein R₁₄ is hydrogen, halogen, C₁ -C₄ alkyl, dioxymethylene, C₁ -C₄ alkoxy, C₂ -C₄ alkenyloxy, C₂ -C₄ alkynyloxy or cyano-C₁ -C₄ alkyl, P is C₁ -C₄ alkyl, C₂ -C₄ alkenyl, C₂ -C₄ alkynyl, C₃ -C₈ cycloalkyl, C₁ -C₄ alkoxy-C₁ -C₄ alkyl, C₂ -C₄ alkeneoxy-C₁ -C₄₆ alkyl, C₂ -C₄ alkyneoxy-C₁ -C₄ alkyl, C₁ -C₄ alkylthio-C₁ -C₄ alkyl, C₂ -C₄ alkenylthio-C₁ -C₄ alkyl, C₂ -C₄ alkynylthio-C₁ -C₄ alkyl, C₁ -C₄ alkylsulfinyl-C₁ -C₄ alkyl, C₁ -C₄ alkylsulfonyl-C₁ -C₄ alkyl, halo-C₁ -C₄ alkyl, cyano-C₁ -C₄ alkyl, 2,2-di-C₁ -C₄ alkoxy-C₁ -C₄ alkyl, 1,3-dioxolan-2-yl-C₁ -C₄ alkyl, 1,3-dioxolan-4-yl-C₁ -C₄ alkyl,2,2-di-C₁ -C₄ alkyl-1,3-dioxolan-4-yl-C₁ -C₄ alkyl, 1,3-dioxan-2-yl-C₁ -C₄ alkyl,2-benzopyranyl-C₁ -C₄ alkyl, C₁ -C₄ alkoxycarbonyl or C₂ -C₄ alkenyloxycarbonyl or tetrahydrofurfuryl-C₁ -C₄ alkyl; the group P-X may also be halogen-C₁ -C₄ alkyl, X, O, S, SO or SO₂, n, 1, 2 or 3, A is a C₁ -C₈ hydrocarbon radical or C₁ -C₈ hydrocarbon radical which is substituted by alkoxy, alkylthio, fluoro, cyano or haloalkyl, and R₁₃ is hydrogen, a C₁ -C₅ hydrocarbon radical, a C₁ -C₅ hydrocarbon radical which is substituted by alkoxy, polyalkoxy, halogen, cyano or trifluoromethyl, C₃ -C₈ cycloalkyl, C₁ -C₄ alkyl-C₃ -C₈ cycloalkyl, di-C₁ -C₄ alkoxy-C₁ -C₄ alkyl, 1,3-dioxolan-2-yl-C₁ -C₄ alkyl, 1,3-dioxolan-4-yl-C₁ -C₄ alkyl, 1,3-dioxan-2-yl-C₁ -C₄ alkyl, furyl-C₁ -C₄ alkyl, tetrahydrofuryl-C₁ -C₄ alkyl or a radical of formula --NHCO₂ R₀₁, --CH₂ CO₂ R₀₁,--CH(CH₃)CO₂ R₀₁ or --CH(R₀₂)--C(R₀₃)═NOR₀₄, wherein R₀₁ is methyl, ethyl, propyl, isopropyl or allyl, R₀₂ and R₀₃ are each hydrogen or C₁ -C₄ alkyl, and R₀₄ is hydrogen, C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₂ -C₄ alkynyl, or R is a radical of formula (H₅ C₂ O)₂ P(O)CH₂ NHCO-- or ##STR13## wherein R₁₅ and R₁₆ are each independently of the other hydroxyl, C₁ -C₄ alkyl, aryl, C₁ -C₄ alkoxy, C₂ -C₄ alkenyloxy, C₂ -C₄ alkynyloxy, C₂ -C₄ haloalkoxy, C₂ -C₈ alkoxyalkoxy, C₁ -C₄ cyanoalkoxy, C₁ -C₄ phenylalkoxy or aryloxy, or aryloxy which is substituted by halogen, cyano, nitro or C₁ -C₄ alkoxy, R₁₇ is hydrogen, C₁ -C₄ alkyl or phenyl, or phenyl which is substituted by halogen, cyano, nitro or C₁ -C₄ alkoxy, R₁₈ is hydrogen, or C₁ -C₄ alkyl, R₁₉ is hydrogen or a radical of formula --COCX₁ X₂ -R₀₆ or a halogen-substituted alkenoyl radical containing 2 to 4 carbon atoms in the alkenyl moiety, wherein X₁ and X₂ are each independently of the other halogen, or a radical of formula --COOR₀₇ or --COR₀₈ or a C₁ -C₄ alkyl, C₁ -C₄ alkenyl or C₁ -C₄ phenylalkyl radical which can be substituted at the phenyl ring by halogen, cyano, nitro or C₁ -C₄ alkoxy, and R₂₀ is hydrogen, C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₂ -C₄ alkynyl, R₀₆ is hydrogen, halogen or C₁ -C₆ alkyl, R₀₇ is C₁ -C₄ alkyl, C₁ -C₄ phenylalkyl or C₁ -C₄ phenylalkyl which is substituted in the phenyl nucleus by halogen, cyano, nitro or C₁ -C₄ alkoxy, and R₀₈ is C₁ -C₄ alkyl, C₂ -C₄ alkenyl, C₂ -C₄ alkynyl, phenyl, C₁ -C₄ phenylalkyl or C₁ -C₄ phenylalkyl which is substituted in the phenyl nucleus by halogen, cyano, nitro or C₁ -C₄ alkoxy, or R is a radical of formula ##STR14## or of formula ##STR15## wherein R₂₁ is methyl, ethyl, propyl, 1-methylethyl, 2-propenyl, 2-butenyl, 1,1-dimethyl-2-propenyl, 2-propynyl or 2-methyl-2-propynyl, and R₂₂, R₂₃, R₂₄ and R₂₅ are each independently of one another hydrogen or methyl, and Y is chloro, or Y is hydrogen if R is a radical of formula (H₅ C₂ O)₂ P(O)CH₂ NHCO--.

The alkyl radicals referred to in connection with the compounds of formulae I and II may be straight-chain or branched and are typically methyl, ethyl, propyl, butyl, pentyl and hexyl, as well as branched isomers thereof. Suitable alkenyl radicals are derived from the cited alkyl radicals. Aryloxy is preferably phenoxy and naphthoxy. By hydrocarbon radicals are meant monovalent or divalent saturated or unsaturated straight-chain or branched or saturated or unsaturated cyclic radicals of carbon and hydrogen, typically alkyl, cycloalkyl, alkenyl, alkynyl, cycloalkenyl and phenyl.

The invention further relates to the use of the novel composition for controlling weeds and grasses in crops of cultivated plants, especially maize.

Compounds of formula II preferably used in the novel composition are those wherein R is a radical of formula ##STR16## wherein R₃₃ and R₃₄ together are ##STR17## R₃₇ and R₃₈ are each independently of the other C₁ -C₄ alkyl; or R₃₇ and R₃₈ together are --(CH₂)₅ -; and R₃₉ is hydrogen, C₁ -C₄ alkyl or ##STR18##

Illustrative examples of especially suitable compounds of formula II are listed in the following Tables 1 and 2.

                                      TABLE 1     __________________________________________________________________________     Compounds of formula II      ##STR19##                         (II)     Cmpd. No.           R.sub.33  R.sub.34                             R.sub.33 + R.sub.34     __________________________________________________________________________     1.001 CH.sub.2CHCH.sub.2                     CH.sub.2CHCH.sub.2                             --     1.002 --        --                              ##STR20##     1.003 --        --                              ##STR21##     1.004 --        --                              ##STR22##     1.005 --        --                              ##STR23##     1.006 --        --                              ##STR24##     1.007 --        --                              ##STR25##     1.008 --        --                              ##STR26##     1.009 --        --                              ##STR27##     1.010            ##STR28##                     CH.sub.2CHCH.sub.2                             --     1.011            ##STR29##                     (CH.sub.3).sub.2 CH                             --     __________________________________________________________________________

                  TABLE 2     ______________________________________     Compounds of formula II     ______________________________________     2.1      (C.sub.2 H.sub.5 O).sub.2 P(O)CH.sub.2NHCOCH.sub.2Cl     2.2               ##STR30##     ______________________________________

Another group of preferred compounds of formula II, wherein R is a radical of formula ##STR31## wherein R₂₁ is methyl, ethyl, propyl, 2-propenyl or 2-butenyl, R₂₂ and R₂₅ are hydrogen. Among these compounds, the compound in which R₂₁ is 2-propenyl is preferred.

Those compounds of formula II are also preferred in which R is a radical of formula ##STR32## wherein R₁ to R₈ are each independently of one another hydrogen or C₁ -C₄ alkyl. Those compounds are particularly suitable in which R₁ to R₇ are hydrogen and R₈ is methyl.

In another group of particularly suitable compounds R is a radical of formula ##STR33## wherein R₁ to R₈ are each independently of one another hydrogen or C₁ -C₄ alkyl. Those compounds in which R₁ to R₇ are hydrogen and R₈ is methyl are particularly suitable.

In another group of particularly suitable compounds, R is a radical of formula ##STR34## wherein R₁₄ is hydrogen, C₁ -C₄ alkyl or C₁ -C₄ alkoxy, P is C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₂ -C₄ alkynyl, X is O or S, n is 1, A is a C₁ -C₈ hydrocarbon radical and R₁₃ is hydrogen or a C₁ -C₅ hydrocarbon radical. Among this group of compounds, those compounds of formula II are preferred in which R₁₄ is C₁ -C₄ alkoxy, P is C₁ -C₄ alkyl, X is O, A is C₁ -C₄ alkylene and R₁₃ is C₁ -C₄ alkyl. The compound in which R₁₄ is methoxy, P is methyl, A is methylene and R₁₃ is isopropyl, is of particular interest.

A further group of preferred compounds of formula II embraces those compounds wherein R is a radical of formula ##STR35## wherein R₁₅ and R₁₆ are each independently of the other hydroxyl, C₁ -C₄ alkyl or C₁ -C₄ alkoxy, R₁₇ and R₁₈ are each independently of the other hydrogen or C₁ -C₄ alkyl, and R₁₉ is hydrogen or a radical of formula --COOR₀₇, wherein R₀₇ is C₁ -C₄ alkyl, and R₂₀ is hydrogen or C₁ -C₄ alkyl. Preferably R₁₆ and R₁₅ are C₁ -C₄ alkoxy, R₁₇ and R₁₈ are hydrogen, R₁₉ is a radical of formula --COOR₀₇, wherein R₀₇ is C₁ -C₄ alkyl, and R₂₀ is hydrogen. The compound in which R₁₅ and R₁₆ are isopropoxy and R₁₉ is --COOC₂ H₅ is of particular importance.

Especially suitable compositions comprise as compound of formula II a compound of formula III ##STR36## or of formula IV ##STR37## or of formula V ##STR38##

The compound of formula I used in the practice of this invention and the preparation thereof are disclosed, inter alia, in DE-A-3 303 388. The compounds of formula II used for the novel compositions and and their preparation are disclosed, inter alia, in U.S. Pat. No. 4,971,618, U.S. Pat. No. 3,959,304, U.S. Pat. No. 4,256,481, U.S. Pat. No.4,708,735, EP-A-149 974, EP-A-304 409, EP-A-31 686, EP-A-54 278, EP-A-23 305, U.S. Pat. No. 4,846,880, EP-A-143 078, EP-A-163 607, EP-A-126 710 as well as DE-A-2 948 535.

The invention also relates to a method of selectively controlling weeds in crops of cultivated plants, which comprises treating said cultivated plants, the seeds or seedlings or the crop area thereof, concurrently or separately, with a herbicidally effective amount of the herbicide of formula I and, to antagonise the herbicide, an antidotally effective amount of a compound of formula II.

Suitable cultivated plants which can be protected by the compound of formula II against the harmful action of the aforementioned herbicides are preferably those which are important in the food or textile sector, typically sugar cane and, in particular, millet and maize, as well as flee and other types of cereals such as wheat, rye, barley and oats.

The weeds to be controlled can be monocot as well as dicot weeds.

Crop areas will be understood as meaning the areas already under cultivation with the cultivated plants or seeds thereof, as well as the areas intended for cropping with said cultivated plants.

Depending on the end use, a safener of formula II can be used for pretreating seeds of the crop plants (dressing of seeds of seedlings) or it can be incorporated in the soil before or after sowing. It can, however, also be applied postemergence by itself alone or together with the herbicide. Treatment of the plant or the seeds with the safener can therefore in principle be carded out irrespective of the time of application of the herbicide. Treatment can, however, also be carried out by simultaneous application of the herbicide and safener (e.g. as tank mixture).

The concentration of safener with respect to the herbicide will depend substantially on the mode of application. Where a field treatment is carded out either by using a tank mixture with a combination of safener and herbicide or by separate application of safener and herbicide, the ratio of safener to herbicide will usually be from 1:100 to 1:1, preferably from 1:20 to 1:1 and, most preferably, 1:1,

In field treatment it is usual to apply 0.00 1 to 5.0 kg/ha, preferably 0.001 to 0.5 kg/ha, of safener.

The concentration of herbicide is usually in the range from 0.001 to 2 kg/ha, but will preferably be from 0.005 to 1 kg/ha.

The compositions of this invention are suitable for all methods of application commonly used in agriculture, including preemergence application, postemergence application and seed dressing.

For seed dressing, 0.001 to 10 g of safener/kg of seeds, preferably 0.05 to 2 g of safener/kg of seeds, is usually applied. If the safener is used in liquid form shortly before sowing to effect soaking, then it is preferred to use safener solutions that contain the active ingredient in a concentration of 1 to 10,000 ppm, preferably of 100 to 1000 ppm.

For application, it is preferred to process the compound of formula II, or mixture of the compound of formula II and the herbicide of formula I, conveniently together with the assistants conventionally employed in formulation technology to emulsifiable concentrates, coatable pastes, directly sprayable or dilutable solutions, dilute emulsions, wettable powders, soluble powders, dusts, granulates or microcapsules.

The formulations are prepared in known manner, conveniently by homogeneously mixing or grinding, or mixing and grinding, the active ingredients with liquid or solid formulation assistants, typically solvents or solid carders. Surface-active compounds (surfactants) may additionally be used for preparing the formulations.

Suitable solvents may typically be: aromatic hydrocarbons, preferably the fractions containing 8 to 12 carbon atoms such as xylene mixtures or substituted naphthalenes; phthalates such as dibutyl or dioctyl phthalate; aliphatic hydrocarbons such as cyclohexane or paraffins; alcohols and glycols and their ethers and esters such as ethanol, diethylene glycol, 2-methoxyethanol or 2-ethoxyethanol; ketones such as cyclohexanone; strongly polar solvents such as N-methyl-2-pyrrolidone, dimethyl sulfoxide or dimethyl formamide; as well as vegetable oils or epoxidised vegetable oils such as epoxidised coconut oil or soybean oil; or water.

The solid carders typically used for dusts and dispersible powders are usually natural mineral fillers such as calcite, talcum, kaolin, montmorillonite or attapulgite. To improve the physical properties it is also possible to add highly dispersed silicic acid or highly dispersed absorbent polymers. Suitable granulated adsorptive carriers are porous types, including pumice, broken brick, sepiolite or bentonite; and suitable nonsorbent carders are materials such as calcite or sand. In addition, innumerable pregranulated materials of inorganic or organic origin may be used, especially dolomite or pulverised plant residues.

Depending on the safener, and usually also on the herbicide, suitable surface-active compounds are nonionic, cationic and/or anionic surfactants having good emulsifying, dispersing and wetting properties. Surfactants will also be understood as comprising mixtures of surfactants.

Suitable anionic surfactants may be water-soluble soaps as well as water-soluble synthetic surface-active compounds.

Suitable soaps are the alkali metal salts, alkaline earth metal salts, ammonium salts or substituted ammonium salts of higher fatty acids (C₁₀ -C₂₂), e.g. the sodium or potassium salts of oleic or stearic acid, or of natural fatty acid mixtures which can be obtained, inter alia, from coconut oil or tallow oil. Further suitable soaps are also the fatty acid methyl taurin salts.

More often, however, so-called synthetic surfactants are used, especially fatty sulfonates, fatty sulfates, sulfonated benzimidazole derivatives or alkylarylsulfonates.

The fatty alcohol sulfonates or sulfates are usually in the form of alkali metal salts, alkaline earth metal salts, ammonium salts or substituted ammonium salts, and they contain a C₈ -C₂₂ alkyl radical which also includes the alkyl moiety of acyl radicals, e.g. the sodium or calcium salt of ligninsulfonic acid, of dodecylsulfate, or of a mixture of fatty alcohol sulfates obtained from natural fatty acids. These compounds also comprise the salts of sulfated and sulfonated fatty alcohol/ethylene oxide adducts. The sulfonated benzimidazole derivatives preferably contain two sulfonic acid groups and one fatty acid radical containing 8 to 22 carbon atoms. Illustrative examples of alkylarylsulfonates are the sodium, calcium or triethanolamine salts of dodecylbenzenesulfonic acid, dibutylnaphthalenesulfonic acid, or of a condensate of naphthalenesulfonic acid and formaldehyde.

Corresponding phosphates, typically salts of the phosphoric acid ester of an adduct of p-nonylphenol with 4 to 14 mol of ethylene oxide, or phospholipids, are also suitable.

Nonionic surfactants are preferably polyglycol ether derivatives of aliphatic or cycloaliphatic alcohols or of saturated or unsaturated fatty acids and alkylphenols, said derivatives containing 3 to 30 glycol ether groups and 8 to 20 carbon atoms in the (aliphatic) hydrocarbon moiety and 6 to 18 carbon atoms in the alkyl moiety of the alkylphenols.

Further suitable nonionic surfactants are the water-soluble polyadducts of polyethylene oxide with polypropylene glycol, ethylenediaminopolypropylene glycol and alkylpolypropylene glycol containing 1 to 10 carbon atoms in the alkyl chain, which polyadducts contain 20 to 250 ethylene glycol ether groups and 10 to 100 propylene glycol ether groups. These compounds usually contain 1 to 5 ethylene glycol units per propylene glycol unit.

Illustrative examples of nonionic surfactants are nonylphenol polyethoxylates, polyethoxylated castor oil, polyadducts of polypropylene and polyethylene oxide, tributylphenol polyethoxylate, polyethylene glycol and octylphenol polyethoxylate,

Fatty acid esters of polyoxyethylene sorbitan are also suitable nonionic surfactants, typically polyoxyethylene sorbitan trioleate.

Cationic surfactants are preferably quaternary ammonium salts carrying, as N-substituent, at least one C₈ -C₂₂ alkyl radical and, as further substituents, unsubstituted or halogenated lower alkyl, benzyl or hydroxy-lower alkyl radicals. The salts are preferably in the form of halides, methyl sulfates or ethyl sulfates, for example stearyl trimethylammonium chloride or benzyl bis(2-chloroethyl)ethylammonium bromide.

The surfactants customarily employed in the art of formulation are described, inter alia, in "Mc Cutcheon's Detergents and Emulsifiers Annual", Mc Publishing Corp., Glen Rock, N.J., 1988, H. Stache, "Tensid-Taschenbuch" (Handbook of Surfactants), Carl Hanser Verlag, Munich/Vienna 1981, and M. and J. Ash, "Encyclopedia of Surfactants", Vol I-III, Chemical Publishing Co., New York, 1980-81.

The agrochemical compositions will usually contain from 0.1 to 99% by weight, preferably from 0.1 to 95% by weight, of compound of formula II or mixture of safener and herbicide, from 1 to 99.9% by weight, preferably from 5 to 99.8% by weight, of a solid or liquid formulation assistant, and from 0 to 25% by weight, preferably from 0.1 to 25% by weight, of a surfactant.

Whereas it is preferred to formulate commercial products as concentrates, the end user will normally use dilute formulations.

The compositions may also contain further ingredients such as stabilisers, antifoams, viscosity regulators, binders, tackifiers, as well as fertilisers or other chemical agents for achieving special effects.

Different methods and techniques may suitably be used for applying the compounds of formula II or compositions containing them for protecting cultivated plants from the harmful effects of herbicides of formula I, conveniently the following:

i) Seed dressing

a) Dressing the seeds with a wettable powder formulation of the compound of formula II by shaking in a vessel until the safener is uniformly distributed on the surface of the seeds (dry treatment), using up to c. 1 to 500 g of compound of formula II (4 g to 2 g of wettable powder) per 100 kg of seeds.

b) Dressing seeds with an emulsifiable concentrate of the compound of formula II by method a) (wet treatment).

c) Dressing by immersing the seeds in a mixture containing 100-1000 ppm of compound of formula II for 1 to 72 hours, leaving them wet or subsequently drying them (seed soaking).

Seed dressing or treatment of the germinated seedlings are naturally the preferred methods of application, as the safener treatment is fully concentrated on the target crop. Usually 1 to 1000 g, preferably 5 to 250 g, of safener is used per 100 kg of seeds. However, depending on the method employed, which also permits the use of other chemical agents or micronutrients, plus or minus deviations from the indicated limiting concentrations are possible (repeat dressing).

ii) Application as a tank mixture

A liquid formulation of a mixture of safener and herbicide (reciprocal ratio from 10:1 to 1:100) is used, the concentration of herbicide being from 0.005 to 5.0 kg/ha. This tank mixture is applied before or after sowing.

iii) Application in the furrow

The safener formulated as emulsifiable concentrate, wettable powder or granulate is applied to the open furrow in which the seeds have been sown. After covering the furrow, the herbicide is applied pre-emergence in conventional manner.

iv) Controlled release of safener

A solution of the compound of formula II is applied to mineral granulate substrates or polymerised granulates (urea/formaldehyde) and allowed to dry. A coating may additionally be applied (coated granulates) which permits controlled release of the safener over a specific period of time.

The invention is illustrated in more detail by the following non-limitative Examples.

Formulation Examples for mixtures of herbicides of formula I and safeners of formula II (throughout, percentages are by weight)

    ______________________________________     F1. Emulsifiable concentrates                        a)      b)      c)   d)     ______________________________________     compound mixture   5%      10%     25%  50%     calcium dodecylbenzenesulfonate                        6%       8%      6%   8%     polyethoxylated castor oil                        4%      --       4%   4%     (36 mol EO)     octylphenol polyethoxylate                        --       4%     --    2%     (7-8 mol EO)     cyclohexanone      --      --      10%  20%     mixture of aromatic hydrocarbons                        85%     78%     55%  16%     C.sub.9 -C.sub.12     ______________________________________

Emulsions of any desired concentration can be prepared by diluting such concentrates with water.

    ______________________________________     F2. Solutions      a)      b)     c)   d)     ______________________________________     compound mixture    5      10%    50%  90%     1-methoxy-3-(3-methoxypropoxy)-                        --      20%    20%  --     propane     polyethylene glycol 400                        20%     10%    --   --     N-methyl-2-pyrrolidone                        --      --     30%  10%     mixture of aromatic hydrocarbons                        75%     60%    --   --     C.sub.9 -C.sub.12     ______________________________________

The solutions are suitable for use as microdrops.

    ______________________________________     F3. Wettable powders                     a)       b)      c)    d)     ______________________________________     compound mixture                     5%       25%     50%   80%     sodium ligninsulfonate                     4%       --       3%   --     sodium laurylsulfate                     2%        3%     --     4%     sodium diisobutylnaphthalene                     --        6%      5%    6%     sulfonate     octylphenol polyethoxylate                     --        1%      2%   --     (7-8 mol EO)     highly dispersed silica                     1%        3%      5%   10%     kaolin          88%      62%     35%   --     ______________________________________

The compound mixture is throughly mixed with the adjuvants and this mixture is ground in a suitable mill to give wettable powders which can be diluted with water to give suspensions of any desired concentration.

    ______________________________________     F4. Coated granulates                    a)          b)      c)     ______________________________________     compound mixture                    0.1%        5%      15%     highly dispersed silica                    0.9%        2%       2%     inorganic carrier                    99.0%       93%     83%     (.O slashed. 0.1-1 mm)     e.g. CaCO.sub.3 or SiO.sub.2     ______________________________________

The compound mixture is dissolved in methylene chloride, the solution is sprayed on to the carrier, and the solvent is removed under vacuum.

    ______________________________________     F5. Coated granulates                    a)          b)      c)     ______________________________________     compound mixture                    0.1%        5%      15%     polyethylene glycol                    1.0%        2%       3%     200     highly dispersed sihca                    0.9%        1%       2%     inorganic carrier                    98.0%       92%     80%     (.O slashed. 0.1-1 mm)     e.g. CaCO.sub.3 or SiO.sub.2     ______________________________________

The finely ground compound mixture is uniformly applied in a mixer to the kaolin moistened with polyethylene glycol. Non-dusty coated granulates are obtained in this manner.

    ______________________________________     F6. Extruder granulates                   a)       b)       c)     d)     ______________________________________     compound mixture                   0.1%     3%       5%     15%     sodium ligninsulfonate                   1.5%     2%       3%      4%     carboxymethyl cellulose                   1.4%     2%       2%      2%     kaolin        97.0%    93%      90%    79%     ______________________________________

The compound mixture is mixed with the adjuvants and the mixture is moistened with water. This mixture is extruded and then dried in a stream of air.

    ______________________________________     F7. Dusts     a)          b)     c)     ______________________________________     compound mixture                   0.1%         1%     5%     talcum        39.9%       49%    35%     kaolin        60.0%       50%    60%     ______________________________________

Ready for use dusts are obtained by mixing the the active ingredient with the carriers on a suitable mill.

    ______________________________________     F8. Suspension concentrates                        a)      b)     c)   d)     ______________________________________     compound mixture   3%      10%    25%  50%     ethylene glycol    5%      5%     5%   5%     nonylphenol polyethoxylate                        --      1%     2%   --     (15 mol EO)     sodium ligninsulfonate                        3%      3%     4%   5%     carboxymethyl cellulose                        1%      1%     1%   1%     37% aqueous formaldehyde solution                        0.2%    0.2%   0.2% 0.2%     silicone oil emulsion                        0.8%    0.8%   0.8% 0.8%     water              87%     79%    62%  38%     ______________________________________

The finely ground compound mixture is intimately mixed with the adjuvants to give a suspension concentrate from which suspensions of any desired concentration can be prepared by dilution with water.

Example B1: Post-emergence phytotoxic action on maize of the herbicide of formula I and of the mixture of the herbicide with the safener of formula II

Maize is sown in standard soil in plastic pots. Immediately after sowing, the test compounds are sprayed onto the plants in the form of an aqueous suspension (500 l of water/ha) prepared from one of the formulations 1 to 10 described above. The concentration of herbicide of formula I is 8000 g/ha. The safener is applied in a concentration of 400 g/ha. The test plants are afterwards cultivated in a greenhouse under optimum conditions. After 22 days the phytotoxic action of the herbicide on the maize is evaluated (in percentage toxicity):

    ______________________________________     Safener    Herbicide Herbicide + Safener     ______________________________________     1.005      65        25     1.008      65        45     1.009      65        25     1.010      65        50     1.011      65        25     2.1        65        20     2.2        65        55     ______________________________________

The results show that the damage caused to the cultivated plants by the herbicide can be markedly reduced with compounds of formula II. 

What is claimed is:
 1. A selective herbicidal composition comprising, in addition to customary inert formulation assistants, a mixture ofa) a herbicidally effective mount of a compound of formula I ##STR39## and b) to antagonise the herbicide, an antidotally effective amount of a compound of formula II

    R--CHYCl                                                   (II)

wherein R is a radical of formula ##STR40## wherein R₃₃ and R₃₄ are each independently of the other C₁ -C₆ alkenyl; or R₃₃ and R₃₄, taken together, are ##STR41## R₃₅ and R₃₆ are each independently of the other hydrogen or C₁ -C₆ alkyl; or R₃₃ and R₃₄, taken together, are ##STR42## R₃₇ and R₃₈ are each independently of the other C₁ -C₄ alkyl, or R₃₇ and R₃₈, taken together, are --(CH₂)₅ -; R₃₉ is hydrogen, C₁ -C₄ alkyl or ##STR43## or R₃₃ and R₃₄, taken together, are ##STR44## and R₄₀, R₄₁, R₄₂, R₄₃, R₄₄, R₄₅, R₄₆, R₄₇, R₄₈, R₄₉, R₅₀, R₅₁, R₅₂, R₅₃, R₅₄ and R₅₅ are each independently of one another hydrogen or C₁ -C₄ alkyl, or R is a radical of formula ##STR45## or R is a radial formula ##STR46## wherein R₁, R₂, R₃ and R₄ are each independently of one another hydrogen, C₁ -C₄ alkyl, C₁ -C₄ alkoxy or C₁ -C₄ haloalkyl, R₅, R₆, R₇ and R₈ are each independently of one another hydrogen, C₁ -C₄ alkyl or C₁ -C₄ haloalkyl, or R is a radical of formula ##STR47## wherein R₉ is C₁ -C₄ alkyl or halogen, R₁₀ is halogen, R₁₁ and R₁₂ are each independently of the other hydrogen or C₁ -C₄ alkyl, and Q is C₁ -C₄ alkylene or alkyl-substituted C₁ -C₄ alkylene, or R is a radical of formula ##STR48## wherein R₁₄ is hydrogen, halogen, C₁ -C₄ alkyl, dioxymethylene, C₁ -C₄ alkoxy, C₁ -C₄ alkenyloxy, C₂ -C₄ alkynyloxy or cyano-C₁ -C₄ alkyl, P is C₁ -C₄ alkyl, C₂ -C₄ alkenyl, C₂ -C₄ alkynyl, C₃ -C₈ cycloalkyl, C₁ -C₄ alkoxy-C₁ -C₄ alkyl, C₂ -C₄ alkeneoxy-C₁ -C₄ alkyl, C₂ -C₄ alkyneoxy-C₁ -C₄ alkyl, C₁ -C₄ alkylthio-C₁ -C₄ alkyl, C₂ -C₄ alkenylthio-C₁ -C₄ alkyl, C₂ -C₄ alkynylthio-C₁ -C₄ alkyl, C₁ -C₄ alkylsulfinyl-C₁ -C₄ alkyl, C₁ -C₄ alkylsulfonyl-C₁ -C₄ alkyl, halo-C₁ -C₄ alkyl, cyano-C₁ -C₄ alkyl, 2,2-di-C₁ -C₄ alkoxy-C₁ -C₄ alkyl, 1,3-dioxolan-2-yl-C₁ -C₄ alkyl, 1,3-dioxolan-4-yl-C₁ -C₄ alkyl, 2,2-di-C₁ -C₄ alkyl-1,3-dioxolan-4-yl-C₁ -C₄ alkyl, 1,3-dioxan-2-yl-C₁ -C₄ alkyl, 2-benzopyranyl-C₁ -C₄ alkyl, C₁ -C₄ alkoxycarbonyl or C₂ -C₄ alkenyloxycarbonyl or tetrahydrofurfuryl-C₁ -C₄ alkyl, the group P-X may also be halogen-C₁ -C₄ alkyl, X is O, S, SO or SO₂, n is 1, 2 or 3, A is a C₁ -C₈ hydrocarbon radical or C₁ -C₈ hydrocarbon radical which is substituted by alkoxy, alkylthio, fluoro, cyano or haloalkyl, and R₁₃ is hydrogen, a C₁ -C₅ hydrocarbon radical, a C₁ -C₅ hydrocarbon radical which is substituted by alkoxy, polyalkoxy, halogen, cyano or trifluoromethyl, C₃ -C₈ cycloalkyl, C₁ -C₄ alkyl-C₃ -C₈ cycloalkyl, di-C₁ -C₄ alkoxy-C₁ -C₄ alkyl, 1,3-dioxolan-2-yl-C₁ -C₄ alkyl, 1,3-dioxolan-4-yl-C₁ -C₄ alkyl, 1,3-dioxan-2-yl-C₁ -C₄ alkyl, furyl-C₁ -C₄ alkyl, tetrahydrofuryl-C₁ -C₄ alkyl or a radical of formula --NHCO₂ R₀₁, --CH₂ CO₂ R₀₁, --CH(CH₃)CO₂ R₀₁ or --CH(R₀₂)--C(R₀₃)═NOR₀₄, wherein R₀₁ is methyl, ethyl, propyl, isopropyl or allyl, R₀₂ and R₀₃ are each hydrogen or C₁ -C₄ alkyl, and R₀₄ is hydrogen, C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₂ -C₄ alkynyl, or R is a radical of formula (H₅ C₂ O)₂ P(O)CH₂ NHCO-- ##STR49## wherein R₁₅ and R₁₆ are each independently of the other hydroxyl, C₁ -C₄ alkyl, aryl, C₁ -C₄ alkoxy, C₂ -C₄ alkenyloxy, C₂ -C₄ alkynyloxy, C₂ -C₄ haloalkoxy, C₂ -C₈ alkoxyalkoxy, C₁ -C₄ cyanoalkoxy, C₁ -C₄ phenylalkoxy or aryloxy, or aryloxy which is substituted by halogen, cyano, nitro or C₁ -C₄ alkoxy, R₁₇ is hydrogen, C₁ -C₄ alkyl or phenyl, or phenyl which is substituted by halogen, cyano, nitro or C₁ -C₄ alkoxy, R₁₈ is hydrogen, or C₁ -C₄ alkyl, R₁₉ is hydrogen or a radical of formula --COCX₁ X₂ --R₀₆ or a halogen-substituted alkenoyl radical containing 2 to 4 carbon atoms in the alkenyl moiety, wherein X₁ and X₂ are each independently of the other halogen, or a radical of formula --COOR₀₇ or --COR₀₈ or a C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₁ -C₄ phenylalkyl radical which can be substituted at the phenyl ring by halogen, cyano, nitro or C₁ -C₄ alkoxy, and R₂₀ is hydrogen, C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₂ -C₄ alkynyl, R₀₆ is hydrogen, halogen or C₁ -C₆ alkyl, R₀₇ is C₁ -C₄ alkyl, C₁ -C₄ phenylalkyl or C₁ -C₄ phenylalkyl which is substituted in the phenyl nucleus by halogen, cyano, nitro or C₁ -C₄ alkoxy, and R₀₈ is C₁ -C₄ alkyl, C₂ -C₄ alkenyl, C₂ -C₄ alkynyl, phenyl, C₁ -C₄ phenylalkyl or C₁ -C₄ phenylalkyl which is substituted in the phenyl nucleus by halogen, cyano, nitro or C₁ -C₄ alkoxy, or R is a radical of formula ##STR50## or of formula ##STR51## wherein R₂₁ is methyl, ethyl, propyl, 1-methylethyl, 2-propenyl, 2-butenyl, 1,1-dimethyl-2-propenyl, 2-propynyl or 2-methyl-2-propynyl, and R₂₂, R₂₃, R₂₄ and R₂₅ are each independently of one another hydrogen or methyl, and Y is chloro, or Y is hydrogen if R is a radical of formula (H₅ C₂ O)₂ P(O)CH₂ NHCO--.
 2. A composition according to claim 1, wherein R is a radical of formula ##STR52## wherein R₃₃ and R₃₄ together are ##STR53## R₃₇ and R₃₈ are each independently of the other C₁ -C₄ alkyl; or R₃₇ and R₃₈ together are --(CH₂)₅ -; and R₃₉ is hydrogen, C₁ -C₄ alkyl or ##STR54##
 3. A composition according to claim 1, wherein R is a radical of formula ##STR55## wherein R₂₁ is methyl, ethyl, propyl, 2-propenyl or 2-butenyl, R₂₂ and R₂₅ are hydrogen.
 4. A composition according to claim 3, wherein R₂₁ is 2-propenyl.
 5. A composition according to claim 1, wherein R is a radical of formula ##STR56## wherein R₁ to R₈ are each independently of one another hydrogen or C₁ -C₄ alkyl.
 6. A composition according to claim 5, wherein R₁ to R₇ are hydrogen and R₈ is methyl.
 7. A composition according to claim 1, wherein R is a radical of formula ##STR57## wherein R₁₄ is hydrogen, C₁ -C₄ alkyl or C₁ -C₄ alkoxy, P is C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₂ -C₄ alkynyl, X is O or S, n is 1, A is a C₁ -C₈ hydrocarbon radical and R₁₃ is hydrogen or a C₁ -C₅ hydrocarbon radical.
 8. A composition according to claim 7, wherein R₁₄ is C₁ -C₄ alkoxy, P is C₁ -C₄ alkyl, X is O, A is C₁ -C₄ alkylene and R₁₃ is C₁ -C₄ alkyl.
 9. A composition according to claim 8, wherein R₁₄ is methoxy, P is methyl, A is methylene and R₁₃ is isopropyl.
 10. A composition according to claim 1, wherein R is a radical of formula ##STR58## wherein R₁₅ and R₁₆ are each independently of the other hydroxyl, C₁ -C₄ alkyl or C₁ -C₄ alkoxy, R₁₇ and R₁₈ are each independently of the other hydrogen or C₁ -C₄ alkyl, and R₁₉ is hydrogen or a radical of formula --COOR₀₇, wherein R₀₇ is C₁ -C₄ alkyl, and R₂₀ is hydrogen or C₁ -C₄ alkyl.
 11. A composition according to claim 10, wherein R₁₆ and R₁₅ are C₁ -C₄ alkoxy, R₁₇ and R₁₈ are hydrogen, R₁₉ is a radical of formula --COOR₀₇, wherein R₀₇ is C₁ -C₄ alkyl, and R₂₀ is hydrogen.
 12. A composition according to claim 11, wherein R₁₅ and R₁₆ are isopropoxy and R₁₉ is --COOC₂ H₅.
 13. A composition according to claim 1, wherein the compound of formula II is selected from the group consisting of a compound of formula III ##STR59## a compound of formula IV ##STR60## and a compound of formula V ##STR61##
 14. A method of selectively controlling weeds and grasses in crops of cultivated plants, which comprises treating said plants, the seeds or the locus thereof, concurrently or separately, with an effective amount of a herbicide of formula I ##STR62## and, to antagonise said herbicide, an antidotally effective amount of a compound of formula II

    R--CHYCl                                                   (II)

wherein R is a radical of formula ##STR63## R₃₃ and R₃₄, are each independently of the other C_(1--C) ₆ alkyl or C₂ -C₆ alkenyl; or R₃₃ and R₃₄, taken together, are ##STR64## R₃₅ and R₃₆ are each independently of the other hydrogen or C₁ -C₆ alkyl; or R₃₃ and R₃₄, taken together, are ##STR65## R₃₇ and R₃₈ are each independently of the other C₁ -C₄ alkyl, or R₃₇ and R₃₈, taken together, are --(CH₂)₅ -; R₃₉ is hydrogen, C₁ -C₄ alkyl or ##STR66## or R₃₃ and R₃₄, taken together, are ##STR67## and R₄₀, R₄₁, R₄₂, R₄₃, R₄₄, R₄₅, R₄₆, R₄₇, R₄₈, R₄₉, R₅₀, R₅₁, R₅₂, R₅₃, R₅₄ and R₅₅ are each independently of one another hydrogen or C₁ -C₄ alkyl, or R is a radical of formula ##STR68## or R is a radical of formula ##STR69## wherein R₁, R₂, R₃ and R₄ are each independently of one another hydrogen, C₁ -C₄ alkyl, C₁ -C₄ alkoxy or C₁ -C₄ haloalkyl, R₅, R₆, R₇ and R₈ are each independently of one another hydrogen, C₁ -C₄ alkyl or C₁ -C₄ haloalkyl, or R is a radical of formula ##STR70## wherein R₉ is C₁ -C₄ alkyl or halogen, R₁₀ is halogen, R₁₁ and R₁₂ are each independently of the other hydrogen or C₁ -C₄ alkyl, and Q is C₁ -C₄ alkylene or alkyl-substituted C₁ -C₄ alkylene, or R is a radical of formula ##STR71## wherein R₁₄ is hydrogen, halogen, C₁ -C₄ alkyl, dioxymethylene, C₁ -C₄ alkoxy, C₂ -C₄ alkenyloxy, C₂ -C₄ alkynyloxy or cyano-C₁ -C₄ alkyl, P is C₁ -C₄ alkyl, C₂ -C₄ alkenyl, C₂ -C₄ alkynyl, C₃ -C₈ cycloalkyl, C₁ -C₄ alkoxy-C₁ -C₄ alkyl, C₂ -C₄ alkenoxy-C₁ -C₄ alkyl, C₂ -C₄ alkynoxy-C₁ -C₄ alkyl, C₁ -C₄ alkylthio-C₁ -C₄ alkyl, C₂ -C₄ alkenylthio-C₁ -C₄ alkyl, C₂ -C₄ alkynylthio-C₁ -C₄ alkyl, C₁ -C₄ alkylsulfinyl-C₁ -C₄ alkyl, C₁ -C₄ alkylsulfonyl-C₁ -C₄ alkyl, halo-C₁ -C₄ alkyl, cyano-C₁ -C₄ alkyl, 2,2-di-C₁ -C₄ alkoxy-C₁ -C₄ alkyl, 1,3-dioxolan-2-yl-C₁ -C₄ alkyl, 1,3-dioxolan-4-yl-C₁ -C₄ alkyl, 2,2-di-C₁ -C₄ alkyl-1,3-dioxolan-4-yl-C₁ -C₄ alkyl, 1,3-dioxan-2-yl-C₁ -C₄ alkyl, 2-benzopyranyl-C₁ -C₄ alkyl, C₁ -C₄ alkoxycarbonyl or C₂ -C₄ alkenyloxycarbonyl or tetrahydrofurfuryl-C₁ -C₄ alkyl, the group P-X is also halo-C₁ -C₄ alkyl, X is O, S, SO or SO₂, n is 1, 2 or 3, A is a C₁ -C₈ hydrocarbon radical or a C₁ -C₈ hydrocarbon radical which is substituted by alkoxy, alkylthio, fluoro, cyano or haloalkyl, and R₁₃ is hydrogen, a C₁ -C₅ hydrocarbon radical, a C₁ -C₅ hydrocarbon radical which is substituted by alkoxy, polyalkoxy, halogen, cyano or trifluoromethyl; C₃ -C₈ cycloalkyl, C₁ -C₄ alkyl-C₃ -C₈ cycloalkyl, di-C₁ -C₄ alkoxy-C₁ -C₄ alkyl, 1,3-dioxolan-2-yl-C₁ -C₄ alkyl, 1,3-dioxolan-4-yl-C₁ -C₄ alkyl 1,3-dioxan-2-yl-C₁ -C₄ alkyl, furyl-C₁ -C₄ alkyl, tetrahydrofuryl-C₁ -C₄ alkyl, or a radical of formula --NHCO₂ R₀₁, --CH₂ CO₂ R₀₁, --CH(CH₃)CO₂ R₀₁ or --CH(R₀₂)--C(R₀₃)═NOR ₀₄, wherein R₀₁ is methyl, ethyl, propyl, isopropyl or allyl, R₀₂ and R₀₃ are each hydrogen or C₁ -C₄ alkyl, and R₀₄ is hydrogen, C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₂ -C₄ alkynyl, or R is a radical of formula (H₅ C₂ O)₂ P(O)CH₂ NHCO-- or ##STR72## wherein R₁₅ and R₁₆ are each independently of the other hydroxyl, C₁ -C₄ alkyl, aryl, C₁ -C₄ alkoxy, C₂ -C₄ alkenyloxy, C₂ -C₄ alkynyloxy, C₂ -C₄ haloalkoxy, C₂ -C₈ alkoxyalkoxy, C₁ -C₄ cyanoalkoxy, C₁ -C₄ phenylalkoxy or aryloxy or aryloxy which is substituted by halogen, cyano, nitro or C₁ -C₄ alkoxy, R₁₇ is hydrogen, C₁ -C₄ alkyl or phenyl, or phenyl which is substituted by halogen, cyano, nitro or C₁ -C₄ alkoxy, R₁₈ is hydrogen, or C₁ -C₄ alkyl, R₁₉ is hydrogen or a radical of formula --COCX₁ X₂ -R₀₆, or an alkenoyl radical which contains 2 to 4 carbon atoms in the alkenyl moiety and which is substituted by halogen, and X₁ and X₂ are each independently of the other hydrogen or halogen, or is a radical of formula --COOR₀₇ or --COR₀₈ or a C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₁ -C₄ phenylalkyl radical which can be substituted at the phenyl ring by halogen, cyano, nitro or C₁ -C₄ alkoxy, and R₂₀ is hydrogen, C₁ -C₄ alkyl, C₂ -C₄ alkenyl or C₂ -C₄ alkynyl, R₀₆ is hydrogen, halogen or C₁ -C₆ alkyl, R₀₇ is C₁ -C₄ alkyl, C₁ -C₄ phenylalkyl or C₁ -C₄ phenylalkyl which is substituted in the phenyl moiety by halogen, cyano, nitro or C₁ -C₄ alkoxy, and R₀₈ is C₁ -C₄ alkyl, C₂ -C₄ alkenyl, C₂ -C₄ alkynyl, phenyl, C₁ -C₄ phenylalkyl or C₁ -C₄ phenylalkyl which is substituted in the phenyl moiety by halogen, cyano, nitro or C₁ -C₄ alkoxy, or R is a radical of formula ##STR73## or of the formula ##STR74## wherein R₂₁ is methyl, ethyl, propyl, 1-methylethyl, 2-propenyl, 2-butenyl, 1,1-dimethyl-2-propenyl, 2-propynyl or 2-methyl-2-propynyl, and R₂₂, R₂₃, R₂₄ and R₂₅ are each independently of one another hydrogen or methyl, and Y is chloro, or Y is hydrogen if R is a radical of formula (H₅ C₂ O)₂ P(O)CH₂ NHCO--.
 15. A method according to claim 14, wherein the plants, the seeds or the locus thereof is treated with 0.001 to 5 kg/ha of a compound of formula I and 0.005 to 0.5 kg/ha of a compound of formula II.
 16. A method according to claim 14, wherein the cultivated plants are maize. 